<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 标题 -->
    <title>渐变球</title>
    <style>
        .d1{
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background-color: white;
            transition: all 2s linear 0s;
        }
        .d1:hover{
           box-shadow: inset 20px 20px 30px 5px black;
       }
    </style>
</head>
<body>
    <div class="d1"></div>
    
</body>
<html>
